Aluminum in Drinking Water

Aluminum sulfate is a chemical compound snd is soluble in water and is mainly used as a coagulating agent in the purification of drinking water and waste water treatment.  The anhydrous form occurs naturally from rocks, soil and feldspar.  Aluminum sulfate is sometimes called alum or papermaker's alum. Aluminum sulfate is used in water purification as a coagulant. In water purification, it causes suspended impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily. This process is called coagulation or flocculation.

Aluminum is easily removed from water by cation exchange resins such as those used in water softeners.  However, Aluminum is not easily washed from the resin by normal salt regeneration. Periodic acid treatment is required to remove the accumulated aluminum from the resin.  This makes self regenerating cation exchange water softener systems unpractical for residential use. Point-of-use methods (POU) such as a reverse osmosis drinking water system or distillation should be employed.

Potential Health Effects of Aluminum in Drinking Water Include High Risk for Dialysis Patients.


Learn more about well water issues and information at and more about reverse osmosis at


Recycle your used water filters the easy way at


Recycle your used water filters the easy way at